Weird Flows results - showing wrong data

[rucysg]

Hi,

I'm looking at the results of a flow that has run. It is showing me different results for the same variable that was not changed.

I'm comparing two arrays. First array is a list of all my users. Second array is the temperature records submitted into SharePoint. I loop through every user in my first list and use filter array to see if they are in the second array. If length of filtered array < 2 (only 1 or 0 records for the day), then send an email alert. I use strCheckEmail to store each user as I loop through the first array. The same variable is used for Send Mail.

You can see from the screenshots that although strCheckEmail=hoongkaixuan, it mysteriously becomes adriantan when the filter array and Send Mail action occurs.

Any idea?

Below is my flow configuration.

My flow settings.Comparing against each array itemstrCheckEmail=hoongkaixuan. However filter array output shows adriantanHere it changes to adriantan.

[Jcook · Accepted solution]

Hello @rucysg 

What is your concurrency set to on the loop?

 Check this by clicking the 3 dots on your apply to each loop > Settings.

Concurrency should be set to 1 or off when using a Set variable action inside a loop.

What you can try is to change the Set variable to a Compose action. And see if the results are the same.

[rucysg]

Thanks @Jcook. The concurrency setting was on. I've turned it off and will see what happens when the flow runs.

Would I still need to use Compose instead of Set?

[Jcook]

@rucysg 

You only need to use Compose if you have Concurrency set higher than 1.

To give some context,

When using a Compose, you can use any concurrency setting, the downfall is anything inside the compose cannot be referenced outside the loop.

A Set variable can be referenced outside a loop, but concurrency cannot be on, or set to higher than 1.